関数型プログラミング言語Haskell Part30 [無断転載禁止]©2ch.net

[650 デフォルトの名無しさん 2017/06/12(月) 20:01:13.71 ID:4tiz7p+p]

GHCi で ["aa", "bb", ["cc", "dd"]] を評価してみれば一発だろうに

• Couldn't match expected type ‘Char’ with actual type ‘[Char]’
• In the expression: "cc"
In the expression: ["cc", "dd"]
In the expression: ["aa", "bb", ["cc", "dd"]]